<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>404 not found</title>
  <style>
    .fullbox, [fullbox] {
      margin: 0 auto;
      padding: 0 0.2rem;
    }

    .page-box, .container, [container] {
      margin: 0 auto;
      padding: 0 0.68rem;
    }

    .row, [row] {
      box-sizing: border-box;
      display: flex;
      flex-flow: row wrap;
    }

    .flex-middle, [flex-middle] {
      align-items: center;
    }

    .flex-item, [flex-item] {
      flex: 0 1 auto;
    }

    .row-nowrap, [row-nowrap] {
      flex-flow: row nowrap;
    }

    .row-space, [row-space] {
      justify-content: space-around;
    }

    .cell, [cell] {
      padding-left: 0.5rem;
      padding-right: 0.5rem;
      flex: 1;
      box-sizing: border-box;
    }
  </style>
</head>
<body>
  <div ccontainer row>
    <div style="margin-top: 2rem;padding:1rem;">
      <h1>Web Site Error: </h1>
      <h2>404: 未发现页面</h2>
    </div>
  </div>
</body>
</html>